26 



BULLETIN 119, V. S. NATIONAL MUSEUM. 



it to make its return motion in a vacuum while the piston of the 

 first cylinder is being carried downward by direct steam pressure. 



Cat. No. 251,299 U.S.N.M. 



i 



FIG. 6. SCHLABBAUM OSCILLATING STEAM ENGINE, 1863. 



Model of H. Schlarbaum Oscillating Steam Engine. TJ. S. Patent, No. 

 39756, September 1, 1863, Transferred from United States Patent Office. 



The engine is a high-pressure, double-acting one. The axis of 

 the vertically oscillating cylinder is near the base, forming a part 

 of the lower cover of the cylinder and beneath the steam and ex- 

 haust ports. On each side of the cylinder and at right angles with 

 the axis of oscillation is a steel-lined surface from which steam 

 ports run to the upper and lower parts of the cylinder. The steam 



